{"version":"1.0","provider_name":"artch - emerging contemporary art","provider_url":"https:\/\/artch.org\/en\/","author_name":"artch","author_url":"https:\/\/artch.org\/en\/author\/artch\/","title":"Silver portraits: wet collodion demonstration - artch - emerging contemporary art","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"KJ8uRjFkpt\"><a href=\"https:\/\/artch.org\/en\/silver-portraits-wet-collodion-demonstration\/\">Silver portraits: wet collodion demonstration<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/artch.org\/en\/silver-portraits-wet-collodion-demonstration\/embed\/#?secret=KJ8uRjFkpt\" width=\"600\" height=\"338\" title=\"&#8220;Silver portraits: wet collodion demonstration&#8221; &#8212; artch - emerging contemporary art\" data-secret=\"KJ8uRjFkpt\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script>\n\/*! This file is auto-generated *\/\n!function(d,l){\"use strict\";l.querySelector&&d.addEventListener&&\"undefined\"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!\/[^a-zA-Z0-9]\/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),o=l.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),c=new RegExp(\"^https?:$\",\"i\"),i=0;i<o.length;i++)o[i].style.display=\"none\";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute(\"style\"),\"height\"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):\"link\"===t.message&&(r=new URL(s.getAttribute(\"src\")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener(\"message\",d.wp.receiveEmbedMessage,!1),l.addEventListener(\"DOMContentLoaded\",function(){for(var e,t,s=l.querySelectorAll(\"iframe.wp-embedded-content\"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute(\"data-secret\"))||(t=Math.random().toString(36).substring(2,12),e.src+=\"#?secret=\"+t,e.setAttribute(\"data-secret\",t)),e.contentWindow.postMessage({message:\"ready\",secret:t},\"*\")},!1)))}(window,document);\n\/\/# sourceURL=https:\/\/artch.org\/wp-includes\/js\/wp-embed.min.js\n<\/script>\n","thumbnail_url":"https:\/\/artch.org\/wp-content\/uploads\/2026\/10\/9.png","thumbnail_width":2560,"thumbnail_height":1260,"description":"An overview of the history of wet collodion, from its invention to its contemporary uses, as well as an introduction to the various chemical processes required to create images using this demanding technique."}